Plz help with this! Explain if you can.

1. are the triangles similar and if so why? what is the value of x? show your work.

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)

Find the measure of the angle indicated in bold